Q: When writing about a significance level, what kind of writing is best?

The significance level is denoted by the Greek letter α and is used to indicate the likelihood of the null hypothesis being rejected. The probability of obtaining a specific result is denoted by the letter p (usually italicized). Most studies consider the level of significance to be 5% but this can vary. When p < α, the null hypothesis is assumed to be rejected.

To answer your question, the most common way of writing this is to say that the significance level is 0.05.

You might also find the following resources useful:

• The correct way to report p values
• 4 Statistical errors researchers should avoid at all costs
• Importance of statistical power in research design
• Biostatistics for beginners [Course]
• Statistical Review [Service]

Hope this helps. All the best for your study!